fix nameof bug for operators

[dsyme]

We have a bug #10143

First we fix the tests so they actually run. This reveals two existing failures

Failed line 242
Failed line 246
let b = nameof(+)
Assert.AreEqual ("line " + string __LINE__) ("+",b)
let b3 = nameof(FSharp.Core.Operators.(+))
Assert.AreEqual ("line " + string __LINE__) ("+",b3)
Obviously this has never worked.

[dsyme]

@cartermp This is ready (once green)

We lost the change related to operators during the development of the PR, and the tests weren't active to prevent this